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Keystone

Past Producer in Amador county in California, United States with commodities Gold, Arsenic, Antimony
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Economic information about the deposit and operations
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10028175
MRDS ID M005016
Record type Site
Current site name Keystone
Related records 10260202

Geographic coordinates

Geographic coordinates: -120.82296, 38.41796 (WGS84)
Relative position WITHIN THE CITY LIMITS OF AMADOR CITY, AJOINING THE SOUTH SPRING HILL MINE TO THE E.

Site location context

Political divisions (FIPS codes)

Amador(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Amador City(quadrangle 1:24,000 scale)

San Andreas(quadrangle 1:100,000 scale)

Sacramento(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Mokelumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Amador

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 007N 010E 36 California

Commodities

Commodity Importance
Gold Primary
Arsenic Critical Tertiary
Antimony Critical Tertiary

Comments on the commodity information

  • GOLD BOTH FREE IN QUARTZ AND ASSOCIATED WITH SULFIDE

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Stibnite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Slate
  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -120.82296, 38.41796
ListMap

Economic information

Ore body information

  • Thickness 60.96M

Comments on the geologic information

  • GEOL.DESC: MAIN OR CONTACT VEIN VARIES IN THICKNESS FROM 12 TO 200 FT. BETWEEN SLATE FOOTWALL, GREENSTONE HANGING WALL. VEIN DIPS FROM 35 TO 65 DEGREES EAST. ORE OCCURED IN VEINS AND QUARTZ STRINGERS BRANCHING FROM VEIN.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1851
Production years 1851 TO 1919 ; 1933 TO 1942

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Keystone Mining Co.
    Home office C/O John D. Culbert

Comments on the production information

  • MINE FORMED OF SEVERAL CLAIMS LOCATED IN 1851 AND WAS ONE OF THE MOST PROFITABLE IN THE MOTHER LODE, PRODUCING $24,000,000 DURING OPERATIONS. WORKED UNTIL 1919; REOPENED IN 1933 AND PRODUCING 1935-1942. IDLE SINCE EXCEPT FOR A SMALL AMOUNT OF WORK DONE IN 1952. MUCH HIGH-GRADE ORE PRODUCED UNTIL 1888. DURING OPERATIONS 1935-1942 PRODUCED ABOUT $1,000,000. PRODUCTION WAS FROM 900 TO 2100 LEVELS, MOSTLY FROM THE 1400 TO THE 2100 LEVELS

Comments on the workings information

  • MAIN SHAFT 2680 FT ON 52 DEGREE INCLINE WITH PRODUCTION ON 900 TO 2100 FT LEVELS, EXTENSIVE CROSSCUTTING. LOCATED 1851 ; WORKED UNTIL 1919 ; REOPENED 1933 UNTIL 1942 BY GOVERNMENT ORDER.

Reference information

Bibliographic references

  • Deposit

    CARLSON, D.W. AND CLARK, W.B., 1954 , MINES AND MIN. RES. OF AMADOR COUNTY, CAL: CJMG VOL. 50 , P. 185

  • Deposit

    DOM BULL. 144, P. 215

  • Production

    CARLSON, D.W. AND CLARK, W.B., 1954

General comments

Subject category Comment text
Deposit ADD. REF.: KEYSTONE GROUP INCLUDES THE KEYSTONE, SPRING HILL, GENEVA, GRANITE STATE, NIAGARA AND EAST KEYSTONE CLAIMS. DIV. OF MINES BULL. 108, P. 91-95, PL. 3; USGS FOLIO 63, CLAIM SHEET 1, SEC. 1 AND P.8. F. Y. ENDING 7/31/1867 APPROX. 12,000 TONS ORE MINED; AVE. YIELD PER TON WAS $12.86 - RES. OF STATES & TERRITORIES W. OF THE ROCKY MTNS. ROSSITER W. RAYMOND. SPEC. COMMISSIONER OF MNG. STATISTICS, TREAS. DEPT - 1869 (GPO REPRINT AS "OLD MINES OF CALIF-NEV., 1964, P. 20-21)

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1972 Gere, W. U.S. Geological Survey
Updater 01-APR-1978 Tatkin, T.; Albers, J. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.